We were there last year and took the trip to de Palma island.
It was a great place to relax and have some beach time.
You can rent snorkel gear, there's a bar and food available as well as a restaurant. The reef area was fantastic at the gift shop you can buy this fish paste and put it your fingers to feed the fish.
I warm you that once you do this you won't be able to move for fish.
I've never seen so many in one spot.